> I'm trying to rotate 1 bit through 2 bytes.

;
;   Rotate the 16 bit value in B1,B0 one bit left.
;
     rlf   b1, w    ;set C to MSB shifted off the end
     rlf   b0       ;rotate low byte, set C to bit shifted off
     rlf   b1       ;rotate the high byte

Rotating the other direction should be an obvious modification.


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